<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" align-center finish-status="success">
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 -->
            <el-form :model="AddForm" :rules="AddFormRules" ref="AddFormRef" label-width="100px" label-position="top">
                <el-tabs tab-position="left"  v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="AddForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="AddForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="AddForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="AddForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cate">
                            <el-cascader v-model="AddForm.goods_cate" :options="catelist" :props="cateProps"
                                    @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox border :label="item1" v-for="(item1, i) in item.attr_vals" :key="i"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name"  v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!--
                            action: 表示图片要上传到的后台API地址,
                            on-preview：预览
                        -->
                        <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove"
                                   list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                            <el-button size="small" type="primary" >点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">商品内容</el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
    </div>
</template>

<script>
    export default {
        name: "Add",
        data() {
            return {
                activeIndex: 0,
                // 添加商品的表单数据对象
                AddForm: {
                    goods_name: '',
                    goods_price: 0,
                    goods_weight: 0,
                    goods_number: 0,
                    // 商品所属的分类数组
                    goods_cate: [],
                    // 图片数组
                    pics: []
                },

                AddFormRules: {
                    goods_name: [
                        { required: true, message: '请输入商品名称', trigger: 'blur' }
                    ],
                    goods_price: [
                        { required: true, message: '请输入商品价格', trigger: 'blur' }
                    ],
                    goods_weight: [
                        { required: true, message: '请输入商品重量', trigger: 'blur' }
                    ],
                    goods_number: [
                        { required: true, message: '请输入商品数量', trigger: 'blur' }
                    ],
                    goods_cate: [
                        { required: true, message: '请选择商品分类', trigger: 'blur' }
                    ]
                },

                // 商品分类列表
                catelist: [],

                cateProps: {
                    expandTrigger: 'hover',
                    value: 'cat_id',
                    label: 'cat_name',
                    children: 'children'
                },
                // 动态参数列表数据
                manyTableData: [],
                // 静态属性列表数据
                onlyTableData: [],
                // 上传图片的URL地址
                uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
                // 图片上传组件的headers请求头对象
                headerObj: {
                    Authorization: window.sessionStorage.getItem('token')
                },
            }
        },
        methods: {
            // 获取商品分类
            async getCateList() {
                const {data: res} = await this.$http.get('categories');
                if(res.meta.status !== 200) {
                    return this.$message.error(res.meta.msg)
                }
                this.catelist = res.data
            },

            // 级联选择器选中变化，会触发这个函数
            handleChange() {
                if(this.AddForm.goods_cate.length !== 3) {
                    this.AddForm.goods_cate = []
                }
            },

            beforeTabLeave(activeName, oldActiveName) {
                // activeName：即将离开的标签页名字
                // oldActiveName：即将进入的标签页的名字
               if(oldActiveName === '0' && this.AddForm.goods_cate.length !== 3){
                   this.$message.error('请先选择商品分类!');
                   return false
               }
            },

            async tabClicked() {
                // console.log(this.activeIndex);
                // 证明访问的是动态参数面板
                if(this.activeIndex === '1') {
                    const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: {
                            sel: 'many'
                        }
                    })
                    if(res.meta.status !== 200) {
                        return this.$message.error(res.meta.msg)
                    }
                    res.data.forEach(item => {
                        item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                    })
                    this.manyTableData = res.data
                }else if(this.activeIndex === '2'){
                    const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: {
                            sel: 'only'
                        }
                    });
                    if(res.meta.status !== 200) {
                        return this.$message.error(res.meta.msg)
                    }
                    console.log(res.data);
                    this.onlyTableData = res.data
                }
            },

            // 处理图片预览效果
            handlePreview() {

            },

            // 处理移除图片的操作
            handleRemove() {

            },

            // 监听图片上传成功的事件
            handleSuccess(response) {
                // 1.拼接得到一个图片信息对象，
                const picInfo = {
                    pic: response.data.tmp_path
                }
                // 2.将图片信息对象，push到pics数组中
                this.AddForm.pics.push(picInfo)
            }

        },
        created() {
            this.getCateList()
        },
        computed: {
            cateId() {
                if(this.AddForm.goods_cate.length === 3){
                    return this.AddForm.goods_cate[2]
                }
                return null
            }
        }
    }
</script>

<style scoped>
    .el-steps {
        margin: 15px 0;
    }

    .el-step__title {
        font-size: 13px;
    }
    .el-checkbox {
        margin: 0 10px 0 0 !important;
    }
</style>